L77DD50SAM4B D-Sub 50 Position Receptacle Connector - Equivalent & Substitute Parts

Part Overview

The L77DD50SAM4B is a 50 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets in a right-angle, through-hole solder termination configuration with a DD shell size. The product is currently active in production with 901 pieces available in new original stock. D-Sub receptacle connectors of this specification are essential components in applications requiring high-density signal interconnection with standardized mechanical and electrical interfaces. Substitute parts may be required due to inventory constraints, supply chain considerations, or specific application requirements within the allowable parameter range.

Substiute Parts

L77DD50SAM4B

Amphenol ICC (Commercial Products)In Stock: 953L77DD50SAM4B Datasheet

Current PartRFQ

DD50S565MTLF

Amphenol ICC (FCI)In Stock: 1128DD50S565MTLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L77DD50SAM4B is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Connector type: Receptacle, Female Sockets
• Number of positions: 50
• Shell size: DD (Size 5)
• Mounting configuration: Through Hole, Right Angle
• Termination method: Solder
• Voltage rating: 300V minimum
• Operating temperature range: -55°C to 125°C minimum
• Shell material finish: Steel, Tin Plated
• Contact finish: Gold
• Flange feature: Housing/Shell (Unthreaded)
• RoHS compliance status: RoHS Compliant

The substitute part DD50S565MTLF meets all mandatory matching parameters and is therefore classified as an equivalent substitute. Both parts share identical connector topology, electrical ratings, environmental specifications, and regulatory compliance status. Variations in contact material composition, contact finish thickness, current rating per contact, and backset spacing represent design differences within the DD-50 receptacle family but do not preclude functional substitution when application requirements fall within the specified operating envelope of both parts.

Parameter Comparison

Engineering Selection Recommendations

Both the L77DD50SAM4B and DD50S565MTLF are active production D-Sub 50 position receptacle connectors from Amphenol ICC with full RoHS compliance and identical electrical ratings of 300V across the -55°C to 125°C operating range. Selection between these parts should be based on the following engineering criteria:

Select L77DD50SAM4B when:

• Application requires 7.5A current rating per connector
• Backset spacing of 0.590" (14.99mm) is specified in PCB layout
• Brass contact material is preferred for specific environmental or corrosion resistance requirements

Select DD50S565MTLF when:

• Application current requirement is 5A per contact or lower
• Backset spacing of 0.370" (9.40mm) is compatible with PCB design
• Enhanced gold plating thickness (30.0µin) is required for high-reliability or extended service life applications
• Phosphor bronze contact material is acceptable

Both parts are certified RoHS compliant and carry identical regulatory status (ECCN: EAR99, HTSUS: 8536.69.4040). Moisture sensitivity level is 1 (Unlimited) for both parts, indicating no special handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can DD50S565MTLF be used as a direct replacement for L77DD50SAM4B in all applications?

A: DD50S565MTLF is functionally equivalent for connector topology, shell size, mounting configuration, and electrical ratings. However, the lower current rating (5A per contact versus 7.5A) and different backset spacing (0.370" versus 0.590") must be verified against application requirements. If the application operates at currents exceeding 5A per contact or requires the 0.590" backset spacing, DD50S565MTLF is not suitable.

Q: What is the significance of the different contact finish thicknesses?

A: L77DD50SAM4B has 8.00µin gold plating, while DD50S565MTLF has 30.0µin gold plating with GXT™ enhancement. Thicker gold plating provides extended contact life and improved corrosion resistance in harsh environments or high-cycle mating applications. For standard industrial applications with moderate mating cycles, both thicknesses are acceptable.

Q: Are the different contact materials (Brass versus Phosphor Bronze) interchangeable?

A: Both brass and phosphor bronze are acceptable contact materials for D-Sub connectors. Phosphor bronze offers superior spring properties and fatigue resistance, while brass provides good electrical conductivity. Selection depends on application-specific requirements for contact retention force and mating cycle durability. Both materials are compatible with the specified gold plating and operating temperature range.

Q: What does the backset spacing difference mean for PCB design?

A: Backset spacing is the distance from the rear of the connector shell to the solder pin termination points. L77DD50SAM4B has 0.590" backset, while DD50S565MTLF has 0.370" backset. These dimensions are critical for PCB layout and component placement. The parts are not interchangeable on the same PCB without redesign of the connector footprint and surrounding component placement.

Q: Are both parts suitable for high-reliability applications?

A: Both L77DD50SAM4B and DD50S565MTLF are active production parts from Amphenol ICC with RoHS compliance and identical voltage/temperature ratings. DD50S565MTLF offers enhanced gold plating (GXT™) which may provide additional reliability margin in high-cycle or harsh environment applications. Both parts meet UL94 V-0 flammability requirements.

Q: What is the difference between the two Amphenol ICC divisions listed as manufacturers?

A: Both parts are manufactured by Amphenol ICC. The designation "(Commercial Products)" versus "(FCI)" reflects internal Amphenol organizational structure. Both divisions maintain equivalent quality standards and certifications. This organizational difference does not affect part compatibility or performance.